Would you run 42.2K across a frozen lake? This Sydneysider did:

Isn’t competing on a frozen lake dangerous? It could have been if the organisers hadn’t done such a great job of preparing the event beforehand. The first one-and-a-half metres of the lake are solid ice but under that is free-flowing water. As the water moves the ice cracks in a process called “breathing” so the organisers had to mark out a course they knew would be safe ahead of time. In some sections there were cracks across the course three to thee-and-a-half metres long. For those they put down planks. There was also a really tricky section at the end of the course made of brash ice (ice that melts, congeals and then freezes again into odd shapes), which is very sharp, slippery and difficult to run on. The organisers had to grade a lot of that section to make it safer for the competitors.